Improvement in head-blocks for saw-mills



v I 3 SheetsSheet 1. G. SELDEN 85 H.-(). KELSEY.

HEAD BLOCK FOR SAWMILLS.

.NO. 104,068. Patented June 7, 1870'.

Wa iwss a; yy faqmfar.

3 Sheets-Sheet 2.

G. SELDEN & H. 0. KELSEY. HEAD BLOCK FOR SAWMILLS.

No. 104,068. Patented June 7, 18 70.

3 Sheets-Sheet 3. G SELDBN-& H. 0. KELSBY.

-HEAD BL'o'cK FOR SAWMILLS.

No. 104,068. Patented June 7, 1870.

GEORGE SELDEN AND H. O. KELSEY, OF ERIE, PENNSYLVANIA, ASSIGN- l ORS TO GEORGE SELDEN.

Letters Patent No. 104,068, dated June 7, 1870.

IMPROVEMENT IN HEAD-BLOCKS FOR SAW-MILLS.

To all whom it may concern.-

Be it known that we, Gnoitcn SELDEN and H. O. KELSEY, of Erie, in the county of Erie and State of Pennsylvania, have invented certain Improvements in Head-Blocks for Saw-Mills, of which the following is a specification.

The nature of our invention consists- First, in providing saw-mill head-blocks with such a combination of levers, pawls and ratchets, pi'nions, pinion and racks,astocause the log to be fed to the saw in a more perfect manner, and with complete accuracy.

Second, in providing head-blocks with independent knees working out from the main knees for the purpose of throwing the log out of the parallelism, and to parallclize the same.

The object of this part of the invention is to enable the operator to throw the log at any angle tothe sawline that he may choose, as in sawing diagonal stuff, and in sawing a tapering log to hold it parallel tothe saw-line, and, if three head-blocks are used, to spring a curving log intoline.

ln the accompanying drawingthere are three plates In Plate No. 1 the figure is aperspectivc view of a machine embodying our invention.

In Plate No. 2, Figure 1 is a view of the feed.

Figure 2 is a top view of -the saine.

In Plate No. 3, Figure 1 is a sectional Viewv of the knee, showing the independent knee, which works inside' of the main knee and the pinion and rack which propel the same, and also the pinion and rack which propel the main knee.

Figure 2 is a view of the feed ratchet and lever of the independent knee, and

Figure 3 is a face view of the main and independerit knees, showing their relative positions, and also showing the pinion and shaft underneath.

The following is a descaiption of our invention:

X is the bed-plate of the head-block, and rests on wooden sills below.

Y is the feed-shaft, and passes from head-block to;

head-block, and on it the propeling or feed-pinions 6 are hung.

O is a forked lever, and ishung on the shaft Y, which acts as its pivot.

Between the prongs of this forked lever O, on the I est movement of the lever 0 will bring some one of the others into use. I

This arrangement is for preventing the slightest amount of lost motion, for with four pawls all the motion that it is possible to lose is one-fourth of the width of one of the notches on the ratchet-wheel S, r

and as the number of pawls is increased the amount of lost motion possible is in that proportion diminished.

These pawls are arrangedonc above the other. This insures a more perfect action of each pawl, for there can be no friction of one upon the other, and also the face of each pawl can be of the same width as the thickness of the ratchet wheel.

On the under and opposite side of the ratchet-wheel will be seen four other pawls V V V V, also of run equal lengths. These are for the purpose of retaining every particle of motion produced, that is, they prevent the slightest giving back of the machine.

These pawls, R B. It R and V V V" V, are tripped by the trips Uand T, respectively, which are worked by the trip-levers M and T respectively.

The motion obtained by the working of the lever O on the shaft Y, as described, is communicated. by means of the pinion 6 to the knees B B, (see plates Nos. 1 and 2,) and as the log which is being sawed rests against their faces, itis, of course, fed to the saw. J is a graduated quadrant attached to the bed X, and

K is a stop, which can be secured at any point on the quadrant by means of a S t scrc-W.

N is a stop-pin, which passes through the prongs of the forked lever O, and when the lever is moved it follows the quadrant and stops the lever when it reaches the stop K.

This arrangementis to regulate the distance to be traversed by the knees at each setting forward of the log toward the saw, and the stop K is set on the quadrant by the operator to suit the thickness ot'stufi it is desired to saw.

When a log is sawed up, it is necessary to gig the knees back for the reception of a new log. This can be accomplished in the following manner: (See plates 1 andfl The trip lcver M is thrown down. This causes the trip U to raise the pawls R R R"R"from the ratchet- I wheel S.- and lets the gig-pawl 8 drop ontothe ratchet.

The trip-lever T is also thrown back. This causes the trip T to raise the, pawls VV' V" V from the ratchet-wheel S. The lever O is then worked by the operator, and the direction of the motion of the shaft is reversed, and, of course, the knees are drawn back.

The second part of our invention consists of an independent knee working out from the knee proper.

A, plates Nos 1 and 3, is the independent knee;

D is a rack and I I is a pinion working in the same.

F is a ratchet-wheel, which is on the same shaft with the pinion I, and these are propelled by thelever G with the pawl By this arrangement the independent knee can be thrown out ahead of the knee B, and drawn back again for, by throwing the pawl H over, the lever G can he made to work the knee A in either direction.

3 and 5 are dogs, by which the independent knee can be held at any point desired.

E and O are r ngsin which the grappling pikes Z are 1 hooked onto the knee, or independent knee, as desired.

By attaching the pike Z to the ring on the independent knee A, and driving the pike into the log it will he held firmly to the face of the independent knee, and no matter inwhich direction the log is moved, the pike will hold it snug to the face of the knee, hence the log can be shoved forward and drawn back hyoperating that knee, A, in the manner described, thus greatly facilitating the manipulation of the log and insuring accuracy.

What we claim is as follows:

1. The trip U, in combination with the pawls It R R R, and the gig-pawl 8', when constructed and op erated as and for the purposes set forth.

2. The lever T and trip T, in combination with the eheck-pawls V V V" V, when constructed and onerated as and for the purposes set forth.

3. The independent knee A, provided with loop 0 and rack D, in combination with the knee B, pinion I, ratchet F, and lever G, with its pawl H, when constructed and operating in the manner and for the purpose specified.

GEO. SELDEN. H. O. KELSEY- Witnesses:

A. N. BRAJ)LEY, J. C. SELDEN. 

